METAL COMPLEXES OF THEOPHYLLINE-7-ACETIC ACID - CRYSTAL STRUCTURE OF A NICKEL(II) COMPOUND CONTAINING NON-COORDINATED THEOPHYLLINE-7-ACETATE ION

摘要

The solids obtained by interaction of theophylline-7-acetic acid with the metal ions nickel(II), cobalt(II) and palladium(II) have been studied by standard thermal and spectroscopic methods. The Structure of the compound formed with nickel(II), hexaaqua nickel(II) theophylline-7-acetate tetrahydrate, has been solved by X-ray diffraction, this being the first example of a metal salt of an anionic purine derivative in which there is not a direct metal-purine bond. Powder X-ray diffraction demonstrates that the cobalt compound is isostructural to the nickel one. A trans-square planar structure with the ligand bound to the palladium via N(9) is proposed for the palladium compound [PdCl2(theophylline-7-acetic acid)(2)]. [References: 18]